US20050173841A1 - System and method for vacuum bag fabrication - Google Patents
System and method for vacuum bag fabrication Download PDFInfo
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- US20050173841A1 US20050173841A1 US11/000,356 US35604A US2005173841A1 US 20050173841 A1 US20050173841 A1 US 20050173841A1 US 35604 A US35604 A US 35604A US 2005173841 A1 US2005173841 A1 US 2005173841A1
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- curable composition
- vacuum bag
- lay
- evacuating
- curing
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 239000000853 adhesive Substances 0.000 claims abstract description 20
- 230000001070 adhesive effect Effects 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 10
- 238000013022 venting Methods 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 11
- 238000004026 adhesive bonding Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000010561 standard procedure Methods 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/60—In a particular environment
- B32B2309/68—Vacuum
Definitions
- This invention relates to the field of adhesive bonding and laminating. Specifically, the present invention relates to systems and methods for bonding and laminating using atmospheric pressure, commonly known as vacuum bagging.
- Vacuum bagging is one of a variety of methods used for the bonding and laminating of manufactured parts. Generally speaking, the part being bonded or laminated is surrounded by an airtight membrane or diaphragm; a vacuum is pulled on that membrane; and the surrounding pressure forces the membrane tightly to the part. Once the part is vacuum bagged it is allowed to cure for a specific period of time depending on its composition. Curing can take place in an oven, autoclave, at room temperature or in a mechanical press.
- All vacuum bags are constructed in essentially the same way.
- a release agent is applied to the tool. This may be a liquid release coating, a wax, or even a solid barrier such as Teflon® tape.
- Teflon® tape When applying the release, the edges of the tool must be masked so the bag sealant tape (BST) will stick to the tool.
- BST is a putty-like material, which comes in rolls, usually 1/2 inch wide, with a release paper on one side.
- the tape is pressed against the tool, leaving the release paper on until it is time apply the bag.
- the tape usually goes on after the assembly to be bonded is placed on the tool.
- peel ply is a tightly woven fabric, often nylon, usually impregnated with some type of release agent. The peel ply may stick to the assembly, but it will pull away without too much difficulty.
- the peel ply is typically a solid sheet.
- release film This is a thin plastic, which has been treated so it will not bond to the laminate. It is highly stretchable so it can conform to complex geometries.
- At least one layer of bleeder cloth goes above the release film.
- Bleeder is a thick, felt-like cloth. It provides a continuous air path for pulling the vacuum. If the bag wrinkles against the hard assembly, it will trap air. The breather prevents this from happening.
- the bag is the last item to be placed. It is a relatively thick plastic layer, available in different amounts of conformability.
- the bag is usually applied along one edge at a time. One starts at one corner and presses the bag into the BST, removing the release paper from the tape as one moves along the edge. It is important to be careful not to get any wrinkles in the bag or it will leak. Pleats are be required for anything but flat or simply curved structures.
- the bag may be heat sealed instead of using the BST.
- a vacuum port is installed through the bag.
- the base of the port goes inside the bag.
- a small cross is cut in the bag for the attachment flange to fit through. If the tool has an area for the port, there must be a breather path from the port to the part. If the port goes on the part itself, several layers of breather are placed under the port to prevent print-through.
- the main aim of adhesive bonding is to produce durable adhesion of one part to another via a layer of adhesive.
- the parts should not be separable from each other for the life of the assembly.
- good adhesion makes rework difficult. If the adhesion is too good, it may not be possible to disassemble the parts even with heating of the adhesive.
- the present invention is a system and method for vacuum bag assembly fabrication via the vacuum bag method which reduces the amount of trapped air.
- the inventive system includes a chamber adapted to contain a vacuum bag and first and second evacuating mechanisms.
- the first evacuating mechanism serves to evacuate the bag and vent to atmosphere.
- the second evacuating mechanism serves to evacuate and vent the chamber to atmosphere.
- the assembly would consist of at least two components and a heat curable composition.
- the components can be parts to be bonded together or layers of cloth to be made into a laminate.
- the heat curable composition would be a catalyzed adhesive or resin.
- the inventive method includes the steps of placing a vacuum bag lay up in an air tight chamber; and evacuating the vacuum bag lay up; and evacuating the air tight chamber. It is important that the vacuum bag lay up and the air tight chamber be evacuated at the same time.
- the inventive method includes the following steps:
- Curing may be accomplished by subjecting the curable composition to sufficient heat for a sufficient time to effect a complete cure with optimum interlaminar bond strength. This is the standard method. Adhesive and resin manufacturers always provide the optimum cure schedules for the materials they provide. However, in an improvement on the standard method, which provides for easy reworking of the assembly via producing less than optimum interlaminar bond strength, especially an assembly of bonded components, the temperature is increased at a fast rate to specification cure temperature. The preferred rate is about 8-12° C. per minute.
- the double vacuum bonding method disclosed herein results in nearly void free bond lines. This enables utilization of adhesive joints with lesser strength adhesives or with thinner bond lines.
- FIG. 1 is a cross sectional diagram of a typical vacuum bag.
- FIG. 2 is a schematic diagram of the use of a typical vacuum bag used in laminating.
- FIG. 3 is a schematic diagram of the use of a typical vacuum bag used in adhesive bonding.
- FIG. 4 is a schematic diagram of the apparatus used for double vacuum bonding in accordance with this invention.
- FIG. 5 is a schematic diagram illustrating movement of the vacuum bag lay up from the double vacuum apparatus to the curing oven in accordance with this invention.
- FIG. 6 is a schematic diagram of an alternate evacuation system for double vacuum bonding in accordance with this invention.
- FIG. 1 illustrates construction of a typical vacuum bag lay up 10 .
- a layer of release agent 14 is placed on the tool 18 .
- the assembly 22 is placed on top of the release agent 14 .
- a tear ply 26 (if needed), a release film 30 and a bleeder 34 .
- Sealant 38 is laid around the assembly 22 at the edge of the tool 18 .
- the bag 42 is laid over the entire assembly and finally a vacuum fitting 54 is installed through the bag 42 .
- the lay up 10 just described is generic. It can be used for lamination of composite materials or adhesive bonding of several parts. Lamination, as illustrated in FIG. 2 , is accomplished, for example, with layers of cloth impregnated with a catalyzed resin 48 .
- the bag 42 is evacuated, for example with a vacuum pump, connected to the vacuum fitting 54 , and the whole evacuated assembly placed in an oven or similar appliance, where heat may be applied to effect curing of the resin. After curing, the bag 42 is vented to atmosphere and the lay up 10 disassembled. Connection of the bag 42 to vacuum and atmosphere is accomplished by means of an appropriately designed manifold 58 incorporating several valves 62 .
- Adhesive bonding is accomplished, for example, by appropriately cleaning the parts 46 a , 46 b and assembling them with a layer of catalyzed adhesive 50 between them.
- the adhesive 50 is typically supplied as a film.
- the bag 42 is evacuated, for example with a vacuum pump, connected to the vacuum fitting 54 , and the whole evacuated assembly placed in an oven or similar appliance, where heat may be applied to effect curing of the adhesive 50 .
- the bag 42 is vented to atmosphere and the lay up 10 disassembled. Connection of the bag 42 to vacuum and atmosphere is accomplished by means of an appropriately designed manifold 58 incorporating several valves 62 .
- Bond lines produced during adhesive bonding using the vacuum bag process are typically 98-100% bond free.
- FIGS. 4 and 5 illustrate the improvement represented by this invention over the prior art. While FIG. 4 illustrates this improvement applied to adhesive bonding, this improvement is equally applicable to lamination.
- the parts 46 a , 46 b are cleaned and assembled with a layer of catalyzed adhesive 50 between them. Then the vacuum bag lay up 10 is made in accordance with the previous descriptions.
- the vacuum bag lay up 10 is finished it is placed in a chamber 66 which is capable of also being evacuated.
- bag 42 and the chamber 66 are evacuated. Evacuation can be performed simultaneously or the bag 42 can be evacuated first. Vacuum is maintained on both 42 , 66 for a time, for example 30 minutes, and then the chamber 66 is brought to atmospheric pressure.
- This configuration is held for another period, for example 10 minutes, and then the bag 42 and its contents are moved to an oven 78 or similar appliance, where heat may be applied to effect curing of the adhesive 50 .
- moving may be accomplished manually or via a wheeled device 74 , such as a gurney.
- the bag 42 may be disconnected from the vacuum pump for the move as long as vacuum is maintained. Those familiar with the vacuum arts will recognize that this is simply accomplished via appropriate valves and quick disconnects.
- the bag 42 is vented to atmosphere and the lay up 10 disassembled. Connection of the bag 42 and chamber 66 to vacuum and atmosphere is accomplished by means of an appropriately designed manifold 70 incorporating several valves 62 .
- FIG. 4 Although a combined evacuation system 70 is illustrated on FIG. 4 , it will be obvious to those most familiar with the art to which this invention pertains, that two evacuation systems, one for the bag 42 and one for the chamber 66 , could alternatively be employed. Such an alternate evacuation system is illustrated in FIG. 6 . Bond lines produced by the improved process of this invention are typically 98% void free.
- Another aspect of this invention is the ability to produce a bond that is amenable to reworking.
- heating to a specific temperature for a specific time cures adhesives.
- Arlon ThermalBond NP a silicone adhesive manufactured by Arlon, Inc., Bear, Del.
- the adhesive typically develops a lap shear strength of 200-300 psi.
- the adhesive is raised to a specific temperature at a specific ramp rate and then held at that temperature for a specific time. It has been found that, with Arlon ThermalBond NP, raising the bond line temperature from room temperature to 100-125° C.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
- This invention was made with Government support under Contract No. F33657-91-C-0006 awarded by the Department of the Air Force. The U.S. Government has certain rights in this invention.
- 1. Field of Invention
- This invention relates to the field of adhesive bonding and laminating. Specifically, the present invention relates to systems and methods for bonding and laminating using atmospheric pressure, commonly known as vacuum bagging.
- 2. Description of the Related Art
- Vacuum bagging is one of a variety of methods used for the bonding and laminating of manufactured parts. Generally speaking, the part being bonded or laminated is surrounded by an airtight membrane or diaphragm; a vacuum is pulled on that membrane; and the surrounding pressure forces the membrane tightly to the part. Once the part is vacuum bagged it is allowed to cure for a specific period of time depending on its composition. Curing can take place in an oven, autoclave, at room temperature or in a mechanical press.
- In adhesive bonding two parts are assembled with a layer of uncured adhesive between them. Typically, a film adhesive is used. The process then applies atmospheric pressure (up to 14.7 psi, depending on altitude). The pressure forces the adhesive layer and the parts into intimate contact thus ensuring good bonds. The vacuum draws out some volatiles and trapped air, resulting in a low void content. Both help to improve resin flow. Vacuum bagging produces strong parts with little air entrapment. The process is adaptable to complex, three-dimensional shapes thus eliminating the need for expensive matched-die molds and presses.
- All vacuum bags are constructed in essentially the same way. Before starting a release agent is applied to the tool. This may be a liquid release coating, a wax, or even a solid barrier such as Teflon® tape. When applying the release, the edges of the tool must be masked so the bag sealant tape (BST) will stick to the tool.
- BST is a putty-like material, which comes in rolls, usually 1/2 inch wide, with a release paper on one side. The tape is pressed against the tool, leaving the release paper on until it is time apply the bag. The tape usually goes on after the assembly to be bonded is placed on the tool.
- Once the assembly is in place the bag is applied. The first item to go down is a peel ply, which is optional. Peel plies are a tightly woven fabric, often nylon, usually impregnated with some type of release agent. The peel ply may stick to the assembly, but it will pull away without too much difficulty. For adhesive bonding, the peel ply is typically a solid sheet.
- After the peel ply comes a layer of release film. This is a thin plastic, which has been treated so it will not bond to the laminate. It is highly stretchable so it can conform to complex geometries.
- At least one layer of bleeder cloth goes above the release film. Bleeder is a thick, felt-like cloth. It provides a continuous air path for pulling the vacuum. If the bag wrinkles against the hard assembly, it will trap air. The breather prevents this from happening.
- The bag is the last item to be placed. It is a relatively thick plastic layer, available in different amounts of conformability. The bag is usually applied along one edge at a time. One starts at one corner and presses the bag into the BST, removing the release paper from the tape as one moves along the edge. It is important to be careful not to get any wrinkles in the bag or it will leak. Pleats are be required for anything but flat or simply curved structures. The bag may be heat sealed instead of using the BST.
- Finally, a vacuum port is installed through the bag. The base of the port goes inside the bag. A small cross is cut in the bag for the attachment flange to fit through. If the tool has an area for the port, there must be a breather path from the port to the part. If the port goes on the part itself, several layers of breather are placed under the port to prevent print-through.
- While vacuum bagging is a good and inexpensive method of fabricating adhesively bonded assemblies, because of the relatively low pressures employed, a fairly thick bond line results and air can still be trapped in the bond line.
- The main aim of adhesive bonding is to produce durable adhesion of one part to another via a layer of adhesive. Ideally, the parts should not be separable from each other for the life of the assembly. However, good adhesion makes rework difficult. If the adhesion is too good, it may not be possible to disassemble the parts even with heating of the adhesive.
- Hence, a need remains in the art for 1) a system or method for performing the vacuum bag process which reduces the amount of trapped air and 2) a system or method for providing adequate adhesion while ensuring that the assembly can be easily reworked.
- The present invention is a system and method for vacuum bag assembly fabrication via the vacuum bag method which reduces the amount of trapped air. The inventive system includes a chamber adapted to contain a vacuum bag and first and second evacuating mechanisms. The first evacuating mechanism serves to evacuate the bag and vent to atmosphere. The second evacuating mechanism serves to evacuate and vent the chamber to atmosphere.
- In practice, the assembly would consist of at least two components and a heat curable composition. The components can be parts to be bonded together or layers of cloth to be made into a laminate. In this case, the heat curable composition would be a catalyzed adhesive or resin.
- Thus, generally, the inventive method includes the steps of placing a vacuum bag lay up in an air tight chamber; and evacuating the vacuum bag lay up; and evacuating the air tight chamber. It is important that the vacuum bag lay up and the air tight chamber be evacuated at the same time.
- In a more specific embodiment, the inventive method includes the following steps:
-
- a) making a vacuum bag lay up via standard techniques;
- b) placing the vacuum bag lay up in an air tight chamber;
- c) evacuating the vacuum bag lay up and the air tight at the same time;
- d) maintaining vacuum on the vacuum bag lay up and the air tight chamber for a first short period, preferably around 30 minutes although the range is from 20 to 30 minutes venting the chamber to atmosphere;
- e) maintaining vacuum on the vacuum bag lay up for a second short period, preferably around 10 minutes, although the range is from 8 to 12 minutes;
- f) moving the vacuum bag lay up to an oven while maintaining vacuum;
- g) curing the curable composition;
- h) venting the vacuum bag lay up to atmosphere; and
- i) removing the assembly from the vacuum bag lay up.
- Curing may be accomplished by subjecting the curable composition to sufficient heat for a sufficient time to effect a complete cure with optimum interlaminar bond strength. This is the standard method. Adhesive and resin manufacturers always provide the optimum cure schedules for the materials they provide. However, in an improvement on the standard method, which provides for easy reworking of the assembly via producing less than optimum interlaminar bond strength, especially an assembly of bonded components, the temperature is increased at a fast rate to specification cure temperature. The preferred rate is about 8-12° C. per minute. The double vacuum bonding method disclosed herein results in nearly void free bond lines. This enables utilization of adhesive joints with lesser strength adhesives or with thinner bond lines.
-
FIG. 1 is a cross sectional diagram of a typical vacuum bag. -
FIG. 2 is a schematic diagram of the use of a typical vacuum bag used in laminating. -
FIG. 3 is a schematic diagram of the use of a typical vacuum bag used in adhesive bonding. -
FIG. 4 is a schematic diagram of the apparatus used for double vacuum bonding in accordance with this invention. -
FIG. 5 is a schematic diagram illustrating movement of the vacuum bag lay up from the double vacuum apparatus to the curing oven in accordance with this invention. -
FIG. 6 is a schematic diagram of an alternate evacuation system for double vacuum bonding in accordance with this invention. - While the present invention is described herein with reference to illustrative embodiments for particular applications, it should be understood that the invention is not limited thereto. Those having ordinary skill in the art and access to the teachings provided herein will recognize additional modifications, applications, and embodiments within the scope thereof and additional fields in which the present invention would be of significant utility.
-
FIG. 1 illustrates construction of a typical vacuum bag lay up 10. A layer ofrelease agent 14 is placed on thetool 18. Theassembly 22 is placed on top of therelease agent 14. On top of that is placed a tear ply 26 (if needed), arelease film 30 and ableeder 34.Sealant 38 is laid around theassembly 22 at the edge of thetool 18. Thebag 42 is laid over the entire assembly and finally a vacuum fitting 54 is installed through thebag 42. - The lay up 10 just described is generic. It can be used for lamination of composite materials or adhesive bonding of several parts. Lamination, as illustrated in
FIG. 2 , is accomplished, for example, with layers of cloth impregnated with a catalyzedresin 48. When the lay up 10 is finished, thebag 42 is evacuated, for example with a vacuum pump, connected to the vacuum fitting 54, and the whole evacuated assembly placed in an oven or similar appliance, where heat may be applied to effect curing of the resin. After curing, thebag 42 is vented to atmosphere and the lay up 10 disassembled. Connection of thebag 42 to vacuum and atmosphere is accomplished by means of an appropriately designedmanifold 58 incorporatingseveral valves 62. - Adhesive bonding, as illustrated in
FIG. 3 , is accomplished, for example, by appropriately cleaning theparts bag 42 is evacuated, for example with a vacuum pump, connected to the vacuum fitting 54, and the whole evacuated assembly placed in an oven or similar appliance, where heat may be applied to effect curing of the adhesive 50. After curing, thebag 42 is vented to atmosphere and the lay up 10 disassembled. Connection of thebag 42 to vacuum and atmosphere is accomplished by means of an appropriately designedmanifold 58 incorporatingseveral valves 62. - Bond lines produced during adhesive bonding using the vacuum bag process are typically 98-100% bond free. Those familiar with the art to which this invention pertains will realize that the above description is merely an outline of the prior art and there are many details that are developed when making use of the vacuum bag process to fabricate any
particular assembly 22. -
FIGS. 4 and 5 illustrate the improvement represented by this invention over the prior art. WhileFIG. 4 illustrates this improvement applied to adhesive bonding, this improvement is equally applicable to lamination. As in the prior art theparts chamber 66 which is capable of also being evacuated. Thenbag 42 and thechamber 66 are evacuated. Evacuation can be performed simultaneously or thebag 42 can be evacuated first. Vacuum is maintained on both 42, 66 for a time, for example 30 minutes, and then thechamber 66 is brought to atmospheric pressure. This configuration is held for another period, for example 10 minutes, and then thebag 42 and its contents are moved to anoven 78 or similar appliance, where heat may be applied to effect curing of the adhesive 50. Depending on the size and weight of the lay up 10, moving may be accomplished manually or via awheeled device 74, such as a gurney. Thebag 42 may be disconnected from the vacuum pump for the move as long as vacuum is maintained. Those familiar with the vacuum arts will recognize that this is simply accomplished via appropriate valves and quick disconnects. After curing of the adhesive 50, thebag 42 is vented to atmosphere and the lay up 10 disassembled. Connection of thebag 42 andchamber 66 to vacuum and atmosphere is accomplished by means of an appropriately designedmanifold 70 incorporatingseveral valves 62. Although a combinedevacuation system 70 is illustrated onFIG. 4 , it will be obvious to those most familiar with the art to which this invention pertains, that two evacuation systems, one for thebag 42 and one for thechamber 66, could alternatively be employed. Such an alternate evacuation system is illustrated inFIG. 6 . Bond lines produced by the improved process of this invention are typically 98% void free. - Another aspect of this invention is the ability to produce a bond that is amenable to reworking. Normally, heating to a specific temperature for a specific time cures adhesives. For example, the manufacturer's recommendation for curing Arlon ThermalBond NP, a silicone adhesive manufactured by Arlon, Inc., Bear, Del., is 5-10 minutes at 100-150° C. When cured at this cure schedule, the adhesive typically develops a lap shear strength of 200-300 psi. In the improvement of this invention, the adhesive is raised to a specific temperature at a specific ramp rate and then held at that temperature for a specific time. It has been found that, with Arlon ThermalBond NP, raising the bond line temperature from room temperature to 100-125° C. at a rate of 7-12° C./minute and maintaining temperature for 10-20 minutes produces lap shear strengths in the range of 130-185 psi. A
programmable oven 78 is required for this aspect of the invention. As can be seen, the lap shear strength developed by use of this invention is less than manufacturer=s specification. Subsequent testing of this invention with actual parts showed that the parts could be easily disassembled with no damage. In other words, this method yields a process by which parts are easily reworkable. - It is therefore intended by the appended claims to cover any and all such applications, modifications and embodiments within the scope of the present invention.
- Accordingly,
Claims (22)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/000,356 US7438781B2 (en) | 2002-03-26 | 2004-11-30 | System and method for vacuum bag fabrication |
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US10/106,313 US20030183331A1 (en) | 2002-03-26 | 2002-03-26 | System and method for vacuum bag fabrication |
US11/000,356 US7438781B2 (en) | 2002-03-26 | 2004-11-30 | System and method for vacuum bag fabrication |
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US10/106,313 Division US20030183331A1 (en) | 2002-03-26 | 2002-03-26 | System and method for vacuum bag fabrication |
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US20050173841A1 true US20050173841A1 (en) | 2005-08-11 |
US7438781B2 US7438781B2 (en) | 2008-10-21 |
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US11/000,356 Expired - Fee Related US7438781B2 (en) | 2002-03-26 | 2004-11-30 | System and method for vacuum bag fabrication |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20060198980A1 (en) * | 2005-01-25 | 2006-09-07 | Saab Ab | Method and apparatus for repairing a composite article |
US20070062959A1 (en) * | 2005-09-21 | 2007-03-22 | Kirk Sneddon | Multilayer composite pressure vessel and method for making the same |
DE102006001494B3 (en) * | 2006-01-11 | 2007-08-02 | Airbus Deutschland Gmbh | Method for producing bond of aircraft components involves covering electrical heating film and aircraft components, by cover sealingly connected with surface of aircraft component, to form cavity |
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US20050136239A1 (en) * | 2003-08-29 | 2005-06-23 | Eichinger Jeffrey D. | Multifunctional cryo-insulation apparatus and methods |
WO2006130384A2 (en) * | 2005-05-27 | 2006-12-07 | The Glad Products Company | Device and method for evacuating a storage bag |
US8715560B2 (en) * | 2005-11-10 | 2014-05-06 | The Boeing Company | Method to control thickness in composite parts cured on closed angle tool |
US20080028730A1 (en) * | 2006-08-02 | 2008-02-07 | Savicki Alan F | Device and Method For Evacuating A Storage Bag |
NL2005667C2 (en) * | 2010-11-11 | 2012-05-14 | Univ Delft Tech | Method for fabrication of a fiber metal laminate. |
US9403350B2 (en) | 2013-12-16 | 2016-08-02 | The Nordam Group, Inc. | Flash control metal bonding |
GB2522904B (en) * | 2014-02-10 | 2016-12-28 | Ge Aviat Systems Ltd | Method of making an airdam |
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US4016022A (en) * | 1975-12-30 | 1977-04-05 | The United States Of America As Represented By The Secretary Of The Air Force | Low flow, vacuum bag curable prepreg material for high performance composite systems |
US4816106A (en) * | 1984-12-13 | 1989-03-28 | Aeritalia Saipa - Gruppo Velivoli Da Trasporto | Method for the controlled curing of composites |
US6827811B2 (en) * | 2002-02-07 | 2004-12-07 | Lynntech, Inc. | Method for vacuum pressing electrochemical cell components |
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US3852136A (en) * | 1971-12-08 | 1974-12-03 | Glaverbel | Production of laminated glazing |
US4357193A (en) * | 1979-05-21 | 1982-11-02 | Rockwell International Corporation | Method of fabricating a composite structure |
JPS61134249A (en) * | 1984-12-04 | 1986-06-21 | 旭硝子株式会社 | Manufacture of safety glass |
DE3851997T2 (en) * | 1987-08-25 | 1995-05-11 | Asahi Glass Co Ltd | Process for press bonding laminated laminates. |
US5618606A (en) * | 1989-09-18 | 1997-04-08 | Rockwell International Corporation | Process for bonding staged composites with a cobonded staged adhesive and article |
US6017484A (en) * | 1997-01-21 | 2000-01-25 | Harold P. Hale | Method for manufacture of minimum porosity, wrinkle free composite parts |
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2002
- 2002-03-26 US US10/106,313 patent/US20030183331A1/en not_active Abandoned
-
2004
- 2004-11-30 US US11/000,356 patent/US7438781B2/en not_active Expired - Fee Related
Patent Citations (3)
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US4016022A (en) * | 1975-12-30 | 1977-04-05 | The United States Of America As Represented By The Secretary Of The Air Force | Low flow, vacuum bag curable prepreg material for high performance composite systems |
US4816106A (en) * | 1984-12-13 | 1989-03-28 | Aeritalia Saipa - Gruppo Velivoli Da Trasporto | Method for the controlled curing of composites |
US6827811B2 (en) * | 2002-02-07 | 2004-12-07 | Lynntech, Inc. | Method for vacuum pressing electrochemical cell components |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060198980A1 (en) * | 2005-01-25 | 2006-09-07 | Saab Ab | Method and apparatus for repairing a composite article |
US20070062959A1 (en) * | 2005-09-21 | 2007-03-22 | Kirk Sneddon | Multilayer composite pressure vessel and method for making the same |
US7497919B2 (en) * | 2005-09-21 | 2009-03-03 | Arde, Inc | Method for making a multilayer composite pressure vessel |
US20090186173A1 (en) * | 2005-09-21 | 2009-07-23 | Kirk Sneddon | Multilayer composite pressure vessel and method for making the same |
US8481136B2 (en) | 2005-09-21 | 2013-07-09 | Arde, Inc. | Multilayer composite pressure vessel and method for making the same |
DE102006001494B3 (en) * | 2006-01-11 | 2007-08-02 | Airbus Deutschland Gmbh | Method for producing bond of aircraft components involves covering electrical heating film and aircraft components, by cover sealingly connected with surface of aircraft component, to form cavity |
Also Published As
Publication number | Publication date |
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US20030183331A1 (en) | 2003-10-02 |
US7438781B2 (en) | 2008-10-21 |
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